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Equations That Changed The World Pencil Bag
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The Pythagorean Theorem, Einstein’s Theory of Relativity, The Law of Gravity … the list goes on. These are some of the mathematical equations that fundamentally changed our understanding of the world. Ponder them while packing your calculator, protractor, abacus, or whatever tools help you solve the problems of the day.
Designed in USA
Recycled Cotton
Compostable Packaging
Carbon Neutral Shipping
Here's a collection of Pencil Bags perfect for keeping all your small items safe. Pick one out and fill it with your favorite fountain pens and a slide rule. Store your keys, wallet and phone together so you can find them later. Keep your lipsticks close at hand, or pack your toiletries for last minute adventuring. Built to accessorize a Shoulder Tote or be used on its own.
| Width | 10" / 250 mm |
| Height | 6" / 150 mm |
| Gusset | 2" / 50 mm |
| Closure | Zipper |
| Material | 100% Recycled canvas, 12 oz |
| Lining | 100% Recycled cotton, 5 oz |
Recycled canvas is made with textile waste cuttings that are otherwise discarded as trash. Instead of filling up the landfill, these cuttings are collected and spun into yarn that is then woven into fabric that can be used again. You may notice some irregularities in the material, this is natural in recycled canvas, since the collected material varies in content.
Region |
Shipping Cost for orders €40+ |
Shipping Cost for orders less than €40 |
| EU | FREE | €5.95 |
| UK, EEA, Europe (non-EU), Türkiye | FREE | €9.95 |
| Middle East, Oceania, Asia | €35 | €35 |
| South America, South Africa | €40 | €40 |
If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.
For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.
Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.
Orders are processed within 1-3 days (Monday-Friday)
Shipping by GLS & UPS 1-5 days
Please double check your shipping address before submitting your order. We are unable to update your address or cancel you order prior to shipping once it is in our system. If your package is returned to us due to an incorrect address or refused delivery, we will refund the cost of the items less a 20% restocking fee if the goods are still in saleable condition. Shipping costs are non-refundable. *Due to international customs policies, packages sent to customers in Türkiye that are refused by the recipient are ineligible for a refund.
To start a return please contact us using the contact form. Returns must be made within 30 days of placing your order.
Frequently Asked Questions
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We ship from The Netherlands to nearly all destinations within Europe, Asia, the Middle East, Oceania, South America & South Africa. You'll be able to select your country and add your address details at checkout. If you're able to find your country, we can ship to you!
Unfortunately at the moment, because of the current political situation, our shipping carriers have suspended delivery to Ukraine and Belarus, so delivery to these locations is not possible.
For destinations in North America & Central America, please visit our USA website.
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Region
Shipping Cost for orders €40+
Shipping Cost for orders less than €40
EU FREE €5.95 UK, EEA, Europe (non-EU), Türkiye FREE €9.95 Middle East, Oceania, Asia €35 €35 South America, South Africa €40 €40 If you live in the UK, EFTA, or anywhere outside of the EU, taxes and import fees may be due upon delivery.
For orders shipping to North America, use our USA website for quicker transit times and more affordable shipping costs.
Delivery to zip codes that UPS considers to be "Remote" are charged the UPS Extended Service area fee of €30 in addition to the standard shipping rates.
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We do our best to pack up orders within 1-2 business days. Orders ship via GLS or UPS depending on the weight and destination. Most orders arrive within 1-8 business days.
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When your order arrives, open it up and take a look. If anything isn't as expected, got damaged in transit, or doesn't fit properly, let us know and we'll make it right.
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No problem! We offer full and partial refunds and exchanges. Read more here.
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Due to the way we make our products, we are unable to customize single items. In general, we cannot change the kind of paper in the notebooks from what you see listed or change the colors, but we are always happy to hear what you'd like to see us make in the future!
Further Research
Let customers speak for us
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Lilla H.
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Really happy with this bottle. It keeps drinks warm for a long time, and it looks great. Build quality feels solid and premium. I would also recommend getting the straw cap addon, it makes it much more practical for everyday use.
Amazing!!
Good weight, crystal clear print, the infuser is easier to clean than any other infuser I've had and keeps the tea warm. Superb!
Anonymous
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wonderful
it is ergonomic, easy to carry, superior material quality, beautiful design
Cojocaru R.
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Absolutely beautiful product!
The quality is very good and the print is fantastic! Very cool umbrella.
Natalie
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Fun gift
I love this stuff! I bought several for my son, along with a notebook, and he loves it!
Beautiful notebook
I recently discovered this small business and couldn’t be more impressed. The craftsmanship and quality are incredible and the products feel carefully made with attention to every detail. What really stands out is how unique the gifts are. They’re meaningful, creative, and perfect for special occasions. It’s refreshing to find something so different from mass-produced items. I bough several items including this beautiful notebook with the markers for my son who is interested in science, and he loves it.
Bellissimo!!! Sono molto contenta!
Great products and Support!
Perfect products and great Support. I will buy here again.
5/5
Excellent quality
Dit o.
Retro Insect Washi Tape
Great bottle, top service
Received This bottle wich looks amazing. It keeps your drinks supercold during a long period.
There was a small problem with the lid, reached out to customer service and was replaced within a week. Top service, top bottle, happy customer
David V.M.
Arctic Ice 500 mL Steel Bottle
Would buy again
Fast delivery to UK and very well packaged to prevent glass breaking.
Have ordered drinking glasses with a different design from here before and the high quality of the product has remained: would definitely buy again.
Willow A.
Mushrooms Drinking Glass
Beautiful gift!
I ordered an insulated water bottle as a birthday present for a friend, with a design that matches the recipient's profession and suited his taste. It was an awesome gift, he loved it!
(The only downside was the transport company GLS - a very poor delivery service. The drivers in our City (Vienna) refuse to deliver directly to the customer. Instead they drop the parcels at the next "parcel drop off station", so you have an extra walk or drive which makes the idea of delivery absurd and leaves the end customer to do their work.) The customer service of Cognitivesurplus tried their best to support me on this. Although they couldn't help with the delivery stuff they were very polite and supportive !!! The product is so beautiful that you forget the hassle again!
Andrea P.
Retro Science Lab 500 mL Steel Bottle
Cette gourde est suoer jolie et qualitative! Ravie!
Great product
High-quality glass with a beautiful design
Lenka K.
Electromagnetic Spectrum Wine Glass
